Can't edit Forums, Topics etc. anymore

I’m using the newest version of bbpress. Today I wanted to change some topic names, but there is no more link to that in the backend. Tried to reach the site for editing through the main dashboard page (where the number of posts, forums, topics etc. is listed). but a error-message shows up (it says something like “cheating?!”). it’s not possible that i don’t have any permission for that since i’m an administrator. what to do??